This is probably off-topic since it isn't really a question, but I thought that this GIF of the fourier series of a square wave was too cool not to share.

enter image description here

  • $\begingroup$ I know the guy who makes those. He is Brazilian and makes many of the animations you see on wikipedia. $\endgroup$ Aug 13, 2013 at 16:58
  • $\begingroup$ There should be some way to edit this DSP visualization into the form of an on-topic question. Anyone? $\endgroup$
    – hotpaw2
    Aug 13, 2013 at 17:54
  • 1
    $\begingroup$ @hotpaw2 Question: Why is this so pretty? :P $\endgroup$ Aug 13, 2013 at 18:23
  • $\begingroup$ epicycles on epicycles! @hotpaw2: or just move it to meta. $\endgroup$
    – endolith
    Aug 14, 2013 at 13:42
  • 2
    $\begingroup$ Question: why does this work? $\endgroup$ Aug 16, 2013 at 10:44

1 Answer 1


Here is an interactive version of the GIF, where you can test how partials add up to shape a certain wave: http://toxicdump.org/stuff/FourierToy.swf


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